1. a) (a+5)/(a-5)(a+5) = 1/a-5.
б) a+3/a-1 + a/a-1 = 2a+3/a-1.
в) 6xy+4y-5x-3y-5xy+5x/10xy = (xy+y)/10xy = y(x+1)/10xy = (x+1)/10x.
2. a) m/3n.
б) (y-3)(y+3)*9y/27y^2 * (y-3) = (y+3)/3y.
в) (m-3)^2/(n-2)(n+2) * 2(n-2)/3(m-3) = (2m-6)/(3n+6).
3. a) - 2x^2 * b^2 / y * 6x^2 = - b^2/3y.
б) (y-8)*3(x-2)/(x-2)(x+2)*2(y-8) = 3/(2x+4).
4. (4a^2-b^2)/2ab^2 * 2ab/(2a+b) = (2a-b)(2a+b)*2ab/2ab^2 * (2a+b) = (2a-b)/b.
5. (для 8а). 4a^3 * 15bc^3 / 15b^3 * c^4 * 4a^2 = a/b^2c.